Utilize additional cooling for the LianLi O11D Dynamic. This allow the rear unused vents to be used as an exhaust or intake. This was created for a 80mm fan to be mounted, which allows more air flow to make the GPU, CPU & VRMs run even cooler. It's made from durable heat resistant ABS. This is easy to install. Available with or without a brand new Coolermaster PMW 15,000 RPM fan. This ensures your equipment remains cool at all times. This mod is incredible.